Signal inter-cut prevention method and system for satellite signal transmission

Abstract

The invention discloses a signal inter-cut prevention method and system for satellite signal transmission, and relates to the technical field of satellite signal transmission. Whether a transmission signal is an inter-cut signal or not is judged by monitoring the transmission signal; if the transmission signal is an inter-cut signal, triggering an inter-cut prevention system; the transmission signal is switched to a pad broadcast signal source, and then a normal signal is transmitted to a user side; the method comprises the following steps: receiving an inter-cut signal, monitoring the inter-cut state of the inter-cut signal, and automatically switching back to a normal signal source after the inter-cut signal is interrupted, so that video mosaic or video interruption can be avoided, a picture abnormity phenomenon caused by a low-quality television signal is prevented, and the signal transmission quality is improved; illegal information of inter-cut signals is prevented from being obtained by a user, real-time monitoring, signal judgment and cooperation of signal switching hardware and software can be achieved to achieve millisecond response, illegal inter-cut is effectively blocked, popular content propagation is avoided, the processing efficiency is high, manual monitoring pressure can be reduced, and safe broadcasting of programs is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of satellite signal transmission technology, and in particular to a method and system for preventing signal interruption in satellite signal transmission. Background Technology

[0002] With the increasing prevalence of satellite signals as a source for broadcast programs, illegal satellite broadcasting has gradually emerged. Illegal satellite broadcasting refers to the unauthorized installation or use of satellite ground receiving facilities, or the illegal interference with or attack on satellite signal transmission systems. Such actions not only violate national laws and regulations but may also seriously endanger national security, social stability, and individual rights.

[0003] When satellite signal transmission is subjected to malicious interruption, its key indicators will show a systematic deterioration, specifically as follows:

[0004] When the power of the interfering signal covers the legitimate signal, the carrier power value at the receiving end will change drastically, resulting in abnormal fluctuations in signal strength.

[0005] As the bit error rate (BER) of the interfering signal power increases exponentially, the signal quality drops precipitously. The BER may jump from the order of 10 to the order of 6 to the order of 10 to the order of 2, and the signal strength (SNR) will typically drop to 10-20 dB, leading to video mosaic or audio interruption. Summary of the Invention

[0006] The purpose of this invention is to address the problem in existing satellite signal transmission systems or methods that suffer from video mosaic or interruption due to illegal or interfering signals being inserted during signal transmission, and to provide a signal anti-interference method and system for satellite signal transmission.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] A method for preventing signal interruption in satellite signal transmission includes the following steps:

[0009] S1. Monitor the transmission signal and determine whether the transmission signal is an insertion signal;

[0010] S2. If the transmitted signal is an interstitial signal, the anti-interstitial system is triggered; the transmitted signal is switched to the interstitial signal source, and then a normal signal is transmitted to the user terminal.

[0011] S3. Monitor the insertion status of the insertion signal, and automatically switch back to the normal signal source after the insertion signal is interrupted.

[0012] This invention monitors and judges transmitted signals to detect whether malicious or illegal insertion signals occur. If the transmitted signal is an inserted signal, it indicates that the transmitted signal has been illegally inserted. By triggering the anti-insertion system, the transmitted signal is switched to a backup signal source to transmit a normal signal to the user end, avoiding interference signals from being received or receiving mismatched signals by the user end. This prevents video mosaic or video interruption, prevents abnormal picture phenomena caused by low-quality television signals, improves the quality of signal transmission, and prevents illegal information from inserted signals from being obtained by the user, such as illegal content containing violence or vulgarity, from being received and presented by the user end, thus enhancing the security and quality of signal transmission.

[0013] Preferably, the signal anti-interception method for satellite signal transmission described in this invention, which monitors the transmitted signal, specifically includes the following steps:

[0014] Monitor at least one of the following: signal strength, signal quality, and bit error rate of the transmitted signal; determine the transmitted signal individually or in combination; if the signal strength is within a first threshold range, and / or the signal quality is within a second threshold range, and / or the bit error rate is within a third threshold range, then determine the transmitted signal as an inserted signal.

[0015] As a preferred embodiment of the present invention, by monitoring at least one of signal strength, signal quality, and bit error rate, it is possible to determine whether the transmitted signal is an inserted signal, either separately or in combination, thereby enhancing the accuracy of identifying illegal or malicious signals, avoiding omissions in identifying illegal or malicious signals, and reducing the probability of normal signals being switched due to over-judgment. This further improves the accuracy of identifying and judging inserted signals and enhances the accuracy of anti-insertion measures.

[0016] Preferably, in the signal anti-interception method for satellite signal transmission described in this invention, the first threshold range includes: rural scenes < 70 dBm, urban scenes < 65 dBm; the second threshold range includes: rural scenes < 15 dBm, urban scenes < 12 dBm; and the third threshold range includes: rural scenes > 10 dBm. -4 Urban scenes > 10 -5 The first threshold range, the second threshold range, and the third threshold range were tested and calibrated using the on-site electromagnetic environment.

[0017] As a preferred embodiment of the present invention, by setting the first threshold range, the second threshold range, and the third threshold range to include the requirements of rural scenarios and urban scenarios, the possibility of missing the identification of illegal or malicious signals can be further reduced, thereby improving the reliability of identification and judgment of inserted signals and improving the accuracy of anti-insertion.

[0018] Preferably, the signal anti-interception method for satellite signal transmission of the present invention monitors at least one of the signal strength, signal quality, and bit error rate of the transmitted signal, specifically including the following steps: storing the real-time signal strength, signal quality, and bit error rate values ​​into corresponding registers through a tuner module; and through I... 2 C-communication reads data from the register, thereby obtaining the real-time signal strength, signal quality, and bit error rate of the transmitted signal.

[0019] As a preferred embodiment of the present invention, the above-described method for detecting transmitted signals can obtain relatively complete signal strength, signal quality, and bit error rate, thereby further improving the reliability of transmitted signal detection.

[0020] Preferably, the signal anti-interception method for satellite signal transmission described in this invention, in monitoring the transmission signal, further includes locking the radio frequency signal: setting the frequency point information of the radio frequency signal; receiving the radio frequency signal through the antenna of the tuner module according to the frequency point, symbol rate and QAM modulation mode in the frequency point information; performing bandpass filtering on the broadband signal in the radio frequency signal to filter out the target frequency band signal; converting the high-frequency radio frequency signal in the radio frequency signal into a fixed intermediate frequency signal; and locking the radio frequency signal at the corresponding frequency point based on phase-locked loop technology.

[0021] As a preferred embodiment of the present invention, the method of locking the frequency point of the radio frequency signal described above can further accurately identify the inserted signal, quickly receive and identify the frequency point of the corresponding radio frequency signal, and thus quickly and accurately lock the radio frequency signal at the corresponding frequency point, further improving the reliability of transmission signal monitoring and improving the efficiency of transmission signal monitoring.

[0022] Preferably, in the signal anti-interception method for satellite signal transmission according to the present invention, the transmitted signal includes a satellite transmitted signal; the normal signal includes IP input signal, ASI input signal and satellite transmitted signal received by the satellite receiver.

[0023] As a preferred embodiment of the present invention, when the received satellite transmission signal is identified as an interstitial signal, the ASI input signal received by the satellite receiver is used as the interstitial signal source to ensure that the program source outputs normal picture.

[0024] Preferably, the signal anti-interruption method for satellite signal transmission described in this invention triggers the anti-interruption system and simultaneously enters the alarm system, sends an alarm prompt to the visual interface, and records the trigger time and abnormal parameter values.

[0025] As a preferred embodiment of the present invention, by entering the alarm system, the satellite signal is alerted to the interference of the interruption, which can remind the monitoring personnel to pay close attention to the satellite signal, facilitate the normal operation of the hardware, avoid the failure of the interruption prevention function, and further improve the reliability of the signal interruption prevention.

[0026] Preferably, the signal anti-interception method for satellite signal transmission according to the present invention, wherein issuing an alarm prompt to the visual interface specifically includes the following steps:

[0027] If multiple parameters in the transmitted signal are abnormal at the same time, a Level 1 emergency alarm will be issued.

[0028] If a single parameter in the transmitted signal remains abnormal, a Level 2 critical alarm will be issued, and a manual review process will be initiated.

[0029] If a single parameter in the transmitted signal experiences three or more consecutive transient anomalies, a Level 3 alert will be issued and the log will be logged; the transient anomaly is defined as a sampling interval of 50ms.

[0030] As a preferred embodiment of the present invention, the above-described signal alarm method can send alarm prompts of different levels to the alarm interface, which can not only automatically switch to the interpolation signal, but also facilitate the detection personnel to take corresponding countermeasures according to the urgency of the alarm, thereby further improving the flexibility of signal anti-interpolation prevention.

[0031] To achieve the objectives of this invention, another technical solution is provided:

[0032] A signal anti-interruption system includes: a signal monitoring module, a signal determination module, and an interruption control module; the signal monitoring module is equipped with a tuner module for acquiring the transmitted signal and locking the frequency point of the transmitted signal; the signal determination module is used to acquire the characteristics of the frequency point from the signal monitoring module and determine whether the transmitted signal is an interruption signal; the interruption control module is used to receive the determination result data of the signal determination module and transmit the interruption signal.

[0033] The signal anti-interruption system described in this invention can achieve millisecond-level response through the coordinated hardware and software of real-time monitoring, signal judgment, and signal switching. It can effectively block illegal interruptions, prevent the spread of vulgar content, and has high processing efficiency, reducing the pressure of manual monitoring and ensuring the safe broadcast of programs.

[0034] Preferably, the signal anti-interruption system of the present invention further includes an alarm module, which is electrically connected to the interruption control module and is used to send alarm prompts to the visual interface.

[0035] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0036] 1. The signal anti-interference method for satellite signal transmission can detect whether malicious or illegal interjection signals occur in the transmitted signal. If the transmitted signal is an interjection signal, it indicates that the transmitted signal has been illegally interjected. By triggering the anti-interference system, the transmitted signal is switched to a backup signal source to transmit a normal signal to the user end, avoiding interference signals from being received or receiving mismatched signals by the user end. This avoids video mosaic or video interruption, prevents abnormal picture phenomena caused by low-quality television signals, improves the quality of signal transmission, and prevents illegal information of the interjection signal from being obtained by the user. It also prevents illegal content such as violence or vulgarity from being received and presented by the user end, thereby enhancing the security and quality of signal transmission.

[0037] 2. The aforementioned signal anti-interruption system can achieve millisecond-level response through the coordinated hardware and software of real-time monitoring, signal judgment, and signal switching. It can effectively block illegal interruptions, prevent the spread of vulgar content, and has high processing efficiency, reducing the pressure of manual monitoring and ensuring the safe broadcast of programs. Attached Figure Description

[0038] Figure 1 This is a flowchart illustrating the signal anti-interception method for satellite signal transmission according to the present invention;

[0039] Figure 2 This is a flowchart illustrating the multi-dimensional detection of transmitted signals in the signal anti-interception method for satellite signal transmission of the present invention.

[0040] Figure 3 This is a schematic diagram of the module structure of the signal anti-interception system of the present invention. Detailed Implementation

[0041] The present invention will now be described in detail with reference to the accompanying drawings.

[0042] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0043] Example 1:

[0044] refer to Figure 1 As shown, this embodiment discloses a method for preventing signal interruption in satellite signal transmission, including the following steps:

[0045] S1. Monitor the transmission signal and determine whether the transmission signal is an insertion signal;

[0046] S2. If the transmitted signal is an interstitial signal, the anti-interstitial system is triggered; the transmitted signal is switched to the interstitial signal source, and then a normal signal is transmitted to the user terminal.

[0047] S3. Monitor the insertion status of the insertion signal, and automatically switch back to the normal signal source after the insertion signal is interrupted.

[0048] It should be noted that the transmission signal described in this invention is understood as an electromagnetic signal used to transmit broadcast or television signals to users. In the specific application scenario of receiving radio frequency signals transmitted by satellite, the transmission signal includes the satellite transmission signal; normal signals include the IP input signal, ASI input signal and satellite transmission signal received by the satellite receiver.

[0049] The transmission signal monitoring described in this invention can detect the transmission signal by locking the frequency point of the transmission signal and obtaining its signal characteristics. Specifically, monitoring the transmission signal includes locking the radio frequency (RF) signal: setting the frequency point information of the RF signal; receiving the RF signal through the antenna of the tuner module according to the frequency point, symbol rate, and QAM modulation mode in the frequency point information; performing bandpass filtering on the broadband signal in the RF signal to filter out the target frequency band signal; converting the high-frequency RF signal in the RF signal into a fixed intermediate frequency (IF) signal; and locking the RF signal at the corresponding frequency point based on phase-locked loop (PLL) technology.

[0050] The frequency point of the locked transmission signal described in this invention can be achieved through a coordinator module and phase-locked loop (PLL) technology. For example, a reference oscillator provides a reference frequency, a phase detector compares the reference signal with the feedback signal, a loop filter eliminates errors, and a voltage-controlled oscillator adjusts the output frequency until it is locked.

[0051] To monitor transmitted signals more accurately or efficiently, the following parameters are considered: signal strength (reflecting the satellite signal reception power level), signal quality (characterizing signal demodulation performance), and bit error rate (quantifying the proportion of transmitted data errors). Specifically, monitoring transmitted signals includes the following steps: monitoring at least one of the transmitted signal's signal strength, signal quality, and bit error rate; judging the transmitted signal individually or in combination; if the signal strength is within a first threshold range, and / or the signal quality is within a second threshold range, and / or the bit error rate is within a third threshold range, then the transmitted signal is determined to be an inserted signal.

[0052] For example, step a: supports single-dimensional detection of any one of the signal strength, signal quality, and bit error rate, or dual-dimensional or full-dimensional detection modes of any two or three items. Users can define custom detection thresholds, such as signal strength less than -65dBm, with comparison conditions being greater than or less than the threshold;

[0053] Step b: Based on the set detection mode, the parameters of the corresponding detection mode are obtained in real time through the above-mentioned TUNER module locking step. Then, they are compared with the set detection threshold. The detection mode uses an "OR" mode to trigger anti-interruption control. When any dimension in the detection mode meets the comparison of the detection threshold, anti-interruption control is triggered.

[0054] Step c: After the anti-interruption control is triggered, firstly, an interruption alarm will pop up on the satellite display interface, then the trigger time and abnormal parameter values ​​in the time log will be recorded, and the signal source will be switched to the ASI interstitial signal source to ensure normal signal output;

[0055] Step d: During the execution of step c, the anti-interruption system will continue to monitor the signal strength, signal quality, and bit error rate obtained from the TUNER module, and check whether it has returned to the normal threshold range.

[0056] Step e: Once the signal source of the tuner module returns to normal, the anti-interruption alarm will be deactivated, and the ASI interstitial signal source will be switched back to the satellite signal source. Normal satellite broadcast programs will then play.

[0057] The first, second, and third threshold ranges mentioned in this invention are not specifically interpreted numerically, but are only used to distinguish the types of threshold ranges. For example, the first threshold range includes: rural scene <70dBm, urban scene <65dBm; the second threshold range includes: rural scene <15dBm, urban scene <12dBm; the third threshold range includes: rural scene >10⁻⁴, urban scene >10⁻⁵; and the first, second, and third threshold ranges are tested and calibrated using the on-site electromagnetic environment.

[0058] Specifically, monitoring at least one of the following parameters in the transmitted signal: signal strength, signal quality, and bit error rate, includes the following steps: storing real-time signal strength, signal quality, and bit error rate values ​​into corresponding registers via the tuner module; and using I... 2 C-communication reads data from the register, thereby obtaining the real-time signal strength, signal quality, and bit error rate of the transmitted signal.

[0059] To achieve dynamic response against satellite signal interruption, for example, when the satellite signal source meets any of the preset first threshold range, second threshold range, or third threshold range, the anti-interruption system is triggered, and the system automatically switches to the ASI backup signal source. Here, ASI stands for Asynchronous Serial Interface, which is an asynchronous serial interface used to transmit TS streams. The satellite receiver has three signal source reception methods: IP input, ASI input, and satellite input. The ASI backup signal serves as a backup normal signal source to deal with interrupted signals.

[0060] Specifically, when the anti-interception system is triggered, the alarm system is activated, an alarm is sent to the visual interface, and the trigger time and abnormal parameter values ​​are recorded.

[0061] Specifically, the alarm notification sent to the visual interface includes the following steps: if multiple parameters in the transmitted signal are abnormal at the same time, a level 1 emergency alarm is issued; if a single parameter in the transmitted signal is continuously abnormal, a level 2 important alarm is issued and a manual review process is initiated; if a single parameter in the transmitted signal is abnormal for more than three consecutive instantaneous times, a level 3 alert alarm is issued and a log is recorded; an instantaneous abnormality is defined as a 50ms interval between each sampling.

[0062] Example 2:

[0063] refer to Figure 2 As shown, based on Embodiment 1, this embodiment discloses a signal anti-interruption system to implement the signal anti-interruption method for satellite signal transmission as described in Embodiment 1, including: a signal monitoring module, a signal determination module, and an interruption control module; the signal monitoring module is equipped with a tuner module for acquiring the transmitted signal and locking the frequency point of the transmitted signal; the signal determination module is used to acquire the characteristics of the frequency point from the signal monitoring module and determine whether the transmitted signal is an interruption signal; the interruption control module is used to receive the determination result data of the signal determination module and transmit the interruption signal.

[0064] Specifically, the anti-interruption system also includes an alarm module. Referring to the anti-interruption method in Embodiment 1, while switching to the ASI interstitial signal source, the anti-interruption system can enter the alarm module and issue an alarm prompt on the visual interface to indicate that the satellite signal is being interfered with by interruption. The signal source has been switched to the local normal ASI interstitial signal source to ensure that the program source outputs normal picture. When the anti-interruption system detects that there is no interference from the interruption signal in the satellite signal source, it automatically switches back from the ASI interstitial signal source to the satellite signal source.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preventing signal interruption in satellite signal transmission, characterized in that, Includes the following steps: S1. Monitor the transmission signal and determine whether the transmission signal is an insertion signal; S2. If the transmitted signal is an interstitial signal, the anti-interstitial system is triggered; the transmitted signal is switched to the interstitial signal source, and then a normal signal is transmitted to the user terminal. S3. Monitor the insertion status of the insertion signal, and automatically switch back to the normal signal source after the insertion signal is interrupted.

2. The signal anti-interception method for satellite signal transmission according to claim 1, characterized in that, Monitoring the transmitted signal specifically includes the following steps: Monitor at least one of the following: signal strength, signal quality, and bit error rate of the transmitted signal; determine the transmitted signal individually or in combination; if the signal strength is within a first threshold range, and / or the signal quality is within a second threshold range, and / or the bit error rate is within a third threshold range, then determine the transmitted signal as an inserted signal.

3. The signal anti-interception method for satellite signal transmission according to claim 2, characterized in that, The first threshold range includes: rural scenes < 70 dBm, urban scenes < 65 dBm; the second threshold range includes: rural scenes < 15 dBm, urban scenes < 12 dBm; the third threshold range includes: rural scenes > 10 dBm. -4 Urban scenes > 10 -5 The first threshold range, the second threshold range, and the third threshold range were tested and calibrated using the on-site electromagnetic environment.

4. The signal anti-interception method for satellite signal transmission according to claim 2, characterized in that, Monitoring at least one of the following parameters in a transmitted signal: signal strength, signal quality, and bit error rate, specifically including the following steps: storing real-time signal strength, signal quality, and bit error rate values ​​into corresponding registers via a tuner module; and using I... 2 C-communication reads data from the register, thereby obtaining the real-time signal strength, signal quality, and bit error rate of the transmitted signal.

5. The signal anti-interception method for satellite signal transmission according to claim 1, characterized in that, Monitoring the transmitted signal also includes locking the radio frequency signal: setting the frequency point information of the radio frequency signal; receiving the radio frequency signal through the antenna of the tuner module according to the frequency point, symbol rate and QAM modulation mode in the frequency point information; performing bandpass filtering on the broadband signal in the radio frequency signal to select the target frequency band signal; converting the high-frequency radio frequency signal in the radio frequency signal into a fixed intermediate frequency signal; and locking the radio frequency signal at the corresponding frequency point based on phase-locked loop technology.

6. The signal anti-interception method for satellite signal transmission according to claim 1, characterized in that, The transmitted signals include satellite transmitted signals; the normal signals include IP input signals, ASI input signals, and satellite transmitted signals received by the satellite receiver.

7. The signal anti-interception method for satellite signal transmission according to any one of claims 1-6, characterized in that, Upon triggering the anti-interception system, the alarm system is activated, an alarm notification is sent to the visual interface, and the trigger time and abnormal parameter values ​​are recorded.

8. The signal anti-interception method for satellite signal transmission according to claim 7, characterized in that, The step of sending an alarm notification to the visual interface includes the following steps: If multiple parameters in the transmitted signal are abnormal at the same time, a Level 1 emergency alarm will be issued. If a single parameter in the transmitted signal remains abnormal, a Level 2 critical alarm will be issued, and a manual review process will be initiated. If a single parameter in the transmitted signal experiences three or more consecutive transient anomalies, a Level 3 alert will be issued and the log will be logged; the transient anomaly is defined as a sampling interval of 50ms.

9. A signal anti-interception system, characterized in that, The method for preventing signal interruption for satellite signal transmission as described in any one of claims 1-8 includes: a signal monitoring module, a signal determination module, and an interruption control module; the signal monitoring module is equipped with a tuner module for acquiring the transmitted signal and locking the frequency point of the transmitted signal; the signal determination module is used to acquire the characteristics of the frequency point from the signal monitoring module and determine whether the transmitted signal is an interrupted signal; the interruption control module is used to receive the determination result data from the signal determination module and transmit the interrupted signal.

10. The signal anti-interception system according to claim 9, characterized in that, It also includes an alarm module, which is electrically connected to the insertion control module and is used to send alarm prompts to the visual interface.

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